Display device

ABSTRACT

A display device includes a display panel having a bent shape with respect to a first bending axis and a second bending axis, the display panel emitting light upward, and the first and second bending axes intersect with each other, a polarizing plate on an upper surface of the display panel and polarizing the light emitted upward, and a first protective film on a lower surface of the display panel, the first protective film including a plurality of first protrusion portions having three-dimensional shapes.

CROSS-REFERENCE TO RELATED APPLICATION

This is a continuation application based on currently pending U.S.patent application Ser. No. 14/715,681, filed on May 19, 2015, thedisclosure of which is incorporated herein by reference in its entirety.U.S. patent application Ser. No. 14/715,681 claims priority benefit ofKorean Patent Application No. 10-2014-0127747, filed on Sep. 24, 2014 inthe Korean Intellectual Property Office, the disclosure of which isincorporated herein by reference in its entirety for all purposes.

BACKGROUND 1. Field

The present disclosure herein relates to a display device, and moreparticularly, to an organic light-emitting display device including anorganic light-emitting diode.

2. Description of the Related Art

An organic light-emitting display device is a display device includingan organic light-emitting diode (OLED). The OLED is a selflight-emitting-type element, which needs no separate light source, andthus the OLED is superior in terms of response speed, viewing angle, andcontrast ratio, as well as power consumption.

An organic light-emitting display device includes a plurality of pixels,such as red pixels, blue pixels, green pixels, white pixels, etc., andmay express full color by combining these pixels. Each pixel includes anorganic light emitting element and a plurality of thin-film transistorsfor driving the element.

An organic light-emitting element of an organic light-emitting displaydevice includes a pixel electrode, a common electrode, and alight-emitting layer located between the two electrodes. One electrodeof the pixel electrode and the common electrode becomes an anodeelectrode and the other becomes a cathode electrode. An electroninjected from the cathode electrode and a hole injected from the anodeelectrode combine to form an exciton, and the exciton emits light withenergy. The common electrodes are formed over a plurality of pixels andmay transfer a constant common voltage. In the case of an organiclight-emitting display device, a polarizing plate may be provided on anupper surface of a display panel to reduce the reflection of incidentlight from the outside, or a touch panel may be provided on the uppersurface of the display panel to detect external contact, or a lowerprotective film may be provided on a lower surface of the display panelto prevent damage to the display panel.

SUMMARY

A display device according to an embodiment may include a display panelhaving a bent shape with respect to a first bending axis and a secondbending axis, the display panel emitting light upward, and the first andsecond bending axes intersect with each other, a polarizing plate on anupper surface of the display panel and polarizing the light emittedupward, and a first protective film on a lower surface of the displaypanel, the first protective film including a plurality of firstprotrusion portions having three-dimensional shapes.

The first protrusion portions may be formed on at least one surface ofan upper surface and a lower surface of the first protective film.

The display panel may have a dome shape.

When the display panel has a convex dome shape bent upward with respectto the first and second bending axes, the first protrusion portions maybe formed on the lower surface of the first protective film.

When the display panel has a concave dome shape bent downward withrespect to the first and second bending axes, the first protrusionportions may be formed on the upper surface of the first protectivefilm.

The first protrusion portions may be arranged in a first directionparallel to the first bending axis and a second direction parallel tothe second bending axis.

The first protrusion portions may be formed to be spaced apart from eachother.

The first protrusion portions may have one three-dimensional shape fromamong a sphere, a semi-sphere, a rectangular cylinder, a triangularcylinder, a circular cylinder, a triangular pyramid, a cone and ahexagonal pyramid.

The display panel may include an organic light-emitting element.

The first protective film may include polyethylenetherephthalate (PET),polyetylenenaphthalate, polycarbonate, polyarylate, polyetherimide,polyethersulphone or polyimide.

The display device may further include a touch-screen panel located onan upper surface of the polarizing film and sensing a touch input.

The touch-screen panel may include a second protective film including asecond protrusion portions having three-dimensional shapes.

The second protrusion portions may be formed on at least one surface ofan upper surface and a lower surface of the second protective film.

The second protrusion portions may be arranged in a first directionparallel to the first bending axis and a second direction parallel tothe second bending axis.

The second protrusion portions may have one three-dimensional shape fromamong a sphere, a semi-sphere, a rectangular cylinder, a triangularcylinder, a circular cylinder, a triangular pyramid, a cone and ahexagonal pyramid.

The display device may further include an adhesive film for attachingthe display panel and the first protective film.

The adhesive film may be a film having a plurality of grooves havingthree-dimensional shapes.

The grooves may be formed on at least one surface of an upper surfaceand a lower surface of the adhesive film.

The grooves may be arranged in a first direction parallel to the firstbending axis and a second direction parallel to the second bending axis.

The grooves may have one three-dimensional shape from among a sphere, asemi-sphere, a rectangular cylinder, a triangular cylinder, a circularcylinder, a triangular pyramid, a cone and a hexagonal pyramid.

BRIEF DESCRIPTION OF THE DRAWINGS

Features will become apparent to those of ordinary skill in the art bydescribing in detail exemplary embodiments with reference to theattached drawings, in which:

FIG. 1A illustrates a front view of a display device according to anexemplary embodiment;

FIG. 1B illustrates a rear perspective view of a display deviceaccording to an exemplary embodiment;

FIG. 2 illustrates a schematic cross-sectional view of the displaydevice of FIG. 1 taken along line A-A′;

FIG. 3A illustrates a three-dimensional view of a display device havinga convex dome shape according to an exemplary embodiment;

FIG. 3B illustrates a cross-sectional view of the display device of FIG.3A taken along line B-B′;

FIG. 4A illustrates a three-dimensional view of a display device havinga concave dome shape according to an exemplary embodiment;

FIG. 4B illustrates a cross-sectional view of the display device of FIG.4A taken along line C-C′;

FIGS. 5A to 5C illustrate cross-sectional views of stages in a methodfor forming first protrusion portions according to an exemplaryembodiment;

FIG. 6 illustrates a schematic cross-sectional view of a touch-screenpanel including a second protective film having second protrusionportions according to an exemplary embodiment; and

FIG. 7 illustrates a schematic cross-sectional view of a display deviceincluding an adhesive film having three-dimensionally-shaped groovesaccording to an exemplary embodiment.

DETAILED DESCRIPTION

Example embodiments will now be descibed moe fully heeinafte withefeence to the accompanying dawings; howeve, they may be embodied indiffeent foms and should not be constued as limited to the embodimentsset foth heein. Rathe, these embodiments ae povided so that thisdisclosue will be thoough and complete, and will fully convey exemplayimplementations to those skilled in the at.

In the drawing figures, the dimensions of layers and regions may beexaggerated for clarity of illustration. It will also be understood thatwhen a layer or element is referred to as being “on” another layer orsubstrate, it can be directly on the other layer or substrate, orintervening layers may also be present. In addition, it will also beunderstood that when a layer is referred to as being “between” twolayers, it can be the only layer between the two layers, or one or moreintervening layers may also be present. Like reference numerals refer tolike elements throughout.

Although the terms used in this specification are selected, as much aspossible, from general terms that are widely used at present whiletaking into consideration functions obtained in accordance with oneembodiment, these terms may be replaced by other terms based onintensions of those skilled in the art, customs, emergence of newtechnologies, or the like. Also, in a particular case, terms that arearbitrarily selected by the applicant may be used. In this case,meanings of these terms may be disclosed in corresponding descriptionparts of the embodiments. Accordingly, it should be noted that the termsused herein should be construed based on practical meanings thereof andthe whole content of this specification, rather than being simplyconstrued based on names of the terms.

FIGS. 1A and 1B illustrate a front view and rear perspective view,respectively, of a display device according to an exemplary embodiment.

Referring to FIG. 1A, a display device 1 may include a display panel 10for emitting light, a first protective film 20 for protecting thedisplay panel 10, and a polarizing plate for polarizing light 30 (FIG.2). The display panel 10 may include a display area DA and a non-displayarea NDA.

In the display area DA of the display panel 10, a plurality of pixelsemitting light and a plurality of signal lines for transmitting drivingsignals to the pixels may be disposed. The pixels receive a plurality ofgate signals and a plurality of data signals through the signal lines,and emit light corresponding to the received gate signals and datasignals. Here, the pixels may include an organic light-emitting diode(OLED).

In the non-display area NDA of the display panel 10, a plurality ofdrive circuits and a plurality of signal lines for transmitting drivingsignals to the pixels of the display area DA may be disposed. The drivecircuits may transmit a plurality of gate signals and a plurality ofdata signals to the pixels of the display area DA through the signallines.

The display panel 10 serves as a base substrate for disposing theabove-mentioned structures and may include a flexible plastic substrate.That is, the display panel 10 may include a plurality of pixels, aplurality of signal lines, and a plurality of drive circuits on theflexible plastic substrate. The flexible plastic substrate may include,e.g., polyethylenetherephthalate (PET), polyetylenenaphthalate,polycarbonate, polyarylate, polyetherimide, polyethersulphone,polyimide, etc.

When a base substrate of the display panel 10 is a flexible plasticsubstrate, the shape of the display panel 10 may be deformed by anexternal force. That is, the display panel 10 may be bent or folded byan external force. This specification relates to a stress alleviationstructure of a bendable display panel 10, and the display panel thatwill be described below denotes a display panel 10 which may be bentwith respect to a predetermined bending axis.

The display panel 10 may be bent with respect to first and secondbending axes D1 and D2, wherein the first and second bending axes D1 andD2 denote bending axes intersecting with each other. As the displaypanel 10 is simultaneously bent with respect to the first and secondbending axes D1 and D2, the display panel 10 may be deformed into a domeshape. When the display panel 10 maintains a dome shape, elementsprepared in the display panel 10 may be stressed so as to be damaged. Toprevent the damage, the display device 1 may include the firstprotective film 20 with a plurality of first protrusion portions, e.g.,first protrusion portions p1_1 to p10_7, in one surface thereof, as willbe described in more detail below with reference to FIG. 1B.

Although not shown in FIGS. 1A and 1B, the polarizing plate 30 (FIG. 2)may be disposed on an upper surface of the display panel 10. Thepolarizing plate 30 may polarize an upwardly incident light from thedisplay panel 10. The polarizing plate 30 may be formed of a transparentmaterial and may have a reflection protection pattern in one surfacethereof for preventing reflection of the incident light from theoutside.

As illustrated in FIG. 2, the first protective film 20 may be disposedon a lower surface of the display panel 10 to prevent damage to thedisplay panel 10, e.g., the display panel 10 may be between the firstprotective film 20 and the polarizing plate 30. The first protectivefilm 20 may include a material with a high hardness to protect thedisplay panel 10 from an external shock. For example, the firstprotective film 20 may include polyethylenetherephthalate (PET),polyetylenenaphthalate, polycarbonate, polyarylate, polyetherimide,polyethersulphone, polyimide, etc. That is, the first protective film 20may be formed of a material which is the same as or different from thatof the base substrate of the display panel 10.

In detail, referring to FIG. 1B, the first protective film 20 mayinclude the plurality of first protrusion portions, e.g., firstprotrusion portions p1_1 to p10_7. The first protrusion portions p1_1 top10_7 may be formed on at least one surface of the upper and lowersurfaces of the first protective film 20. For example, as illustrated inFIG. 1B, the first protrusion portions p1_1 to p10_7 may be formed atequal distances from each other along two directions to overlap amajority of the lower surface of the first protective film 20. FIG. 1Bis a rear perspective view of the display device 1 illustrating thefirst protrusion portions p1_1 to p10_7 formed on the lower surface ofthe first protective film 20.

As the first protective film 20 has the first protrusion portions p1_1to p10_7 formed in one surface thereof, damage to the elements includedin the display panel 10 may be prevented by alleviating stress exertedon the display panel 10 caused by bending of the display panel 10. Also,as the first protective film 20 has the first protrusion portions p1_1to p10_7 formed in one surface thereof, a crease or a curve on thesurface of the display panel 10 (during bending of the display panel 10along the first and second bending axes D1 and D2) may be prevented.More detailed descriptions thereof will be given below with reference toFIGS. 3 and 4.

The first protrusion portions p1_1 to p10_7 may have variousthree-dimensional shapes. For example, the first protrusion portionsp1_1 to p10_7 may be spheres, semi-spheres, rectangular cylinders,triangular cylinders, circular cylinders, triangular pyramids, cones,hexagonal pyramids, etc. For example, as illustrated in FIG. 1B, thedisplay device 1 may include semi-spherically shaped first protrusionportions p1_1 to p10_7. Hereinafter, only for convenience ofdescription, the first protrusion portions p1_1 to p10_7 of the displaydevice 1 are described and referred to as semi-spherical.

As the first protrusion portions p1_1 to p10_7 are formed in athree-dimensional shape, the generation of a surface crease and damageof elements caused by stress may be prevented even though the displaypanel 10 is bent with respect to any bending axis. For example, when thedisplay panel 10 is bent with respect to the first and second bendingaxes D1 and D2 and forms a dome shape, the generation of surface creasesin the display panel 10 and damage to elements in the display panel 10caused by stress may be prevented or substantially minimized. This isbecause stress exerted from various directions may be alleviated sincethe first protrusion portions p1_1 to p10_7 are formed inthree-dimensional shapes. Therefore, an effect is achieved such that thedisplay panel 10 including solid-type first protrusion portions p1_1 top10_7 may be bent in various directions, e.g., a vertical-horizontaldirection, lateral-longitudinal direction, diagonal direction, etc.

Referring to FIG. 2, the first protrusion portions p1_1 to p10_7 may bearranged in a regular or an irregular manner on the first protectivefilm 20. For example, when arranged in a regular manner, the firstprotrusion portions p1_1 to p10_7 may be arranged in a first directionparallel to the first bending axis D1 and a second direction parallel tothe second bending axis D2. The first protrusion portions p1_1 to p10_7thus arranged may form a plurality of rows and a plurality of columns,i.e., a matrix pattern, on the first protective film 20.

In addition, the first protrusion portions p1_1 to p10_7 may be formedto be adjacent to each other, e.g., and contact each other, or to bespaced apart from each other. For example, when the first protrusionportions p1_1 to p10_7 are formed to be spaced apart from each other, apredetermined vacant space may exist between the first protrusionportions p1_1 to p10_7, e.g., each first protrusion portion of the firstprotrusion portions p1_1 to p10_7 may be spaced apart from an adjacentfirst protrusion portion along two perpendicular directions. In anotherexample, when the first protrusion portions p1_1 to p10_7 contact eachother, a predetermined vacant space may exist between the firstprotrusion portions p1_1 to p10_7 due to the solid shapes of the firstprotrusion portions p1_1 to p10_7, e.g., the semi-spherical shape ofeach first protrusion portion of the first protrusion portions p1_1 top10_7 defines a space between two curvatures contacting each other.Therefore, as the display panel 10 is bent, the first protrusionportions p1_1 to p10_7 may converge to the vacant space formed betweenthe first protrusion portions p1_1 to p10_7, and as a result, stressexerted on the display panel 10 may be alleviated. More detaileddescriptions thereof will be given below with reference to FIGS. 3A and3B.

FIG. 2 illustrates a cross-sectional view of the display device of FIG.1 taken along line A-A′ according to an exemplary embodiment.

Referring to FIG. 2, the display device 1 may include the polarizingplate 30 on the upper surface, and the first protective film 20 on thelower surface with respect to display panel 10. That is, the displaydevice 1 may have a structure in which the first protective film 20, thedisplay panel 10, and the polarizing plate 30 are successively stackedone after another. Three-dimensionally-shaped first protrusion portionsp6_2 to p6_6 may be formed on the bottom surface of the first protectivefilm 20, e.g., the first protective film 20 may be between the displaypanel 10 and the first protrusion portions p6_2 to p6_6. Since thedisplay device 1 of FIG. 1 includes the first protrusion portions p6_2to p6_6, the cross-section of the protrusion portions p6_2 to p6_6 maybe a semi-circle, as illustrated in FIG. 2.

The display device 1 may further include a touch-screen panel 40 on theupper surface of the polarizing plate 30. The touch-screen panel 40 maysense a touch pressure on the display device 1. The touch-screen panel40 may also include a second protective film for alleviating stresswhich may be exerted on the panel, and the second protective film mayalso include a plurality of protrusion portions as the first protectivefilm 20. More detailed descriptions about the second protective film ofthe touch-screen panel 40 will be given below with reference to FIG. 6.

FIG. 3A illustrates a three-dimensional view of a display device havinga convex dome shape according to an exemplary embodiment. FIG. 3B is across-sectional view of the display device of FIG. 3A taken along lineB-B′ according to an exemplary embodiment.

Referring to FIG. 3A, when the display panel 10 is bent upward withrespect to the first and second bending axes D1 and D2, the displaydevice 1 may be formed in an upwardly convex dome shape. Here, the firstand second bending axes D1 and D2 may be bending axes intersecting witheach other at vertical angles.

Referring to FIG. 3B, when the display device 1 is formed in a convexdome shape, the first protrusion portions p6_2 to p6_6 may be formed onthe lower surface of the first protective film 20. When the displaypanel 10 is bent into the dome shape of FIG. 3A, the first protrusionportions p6_2 to p6_6 formed on the lower surface of the display panel10 converge to a vacant space located between the first protrusionportions p6_2 to p6_6, e.g., a distance between adjacent firstprotrusion portions p6_2 to p6_6 on a bent surface of the firstprotective film 20 may decrease, to alleviate the stress which may beexerted on the display panel 10.

FIG. 4A illustrates a three-dimensional view of a display device havinga concave dome shape according to an exemplary embodiment. FIG. 4B is across-sectional view of the display device of FIG. 4A taken along lineC-C′ according to an exemplary embodiment.

Referring to FIG. 4A, when the display panel 10 is bent downward withrespect to the first and second bending axes D1 and D2, the displaydevice 1 may be formed in an upwardly concave dome shape. Here, thefirst and second bending axes D1 and D2 may be bending axes intersectingwith each other at vertical angles.

Referring to FIG. 4B, when the display device 1 is formed in a concavedome shape, the first protrusion portions p6_2 to p6_6 may be formed onthe upper surface of the first protective film 20, e.g., the firstprotrusion portions p6_2 to p6_6 may be between the display panel 10 andthe first protective film 20. When the display panel 10 is bentdownward, the first protrusion portions p6_2 to p6_6 formed on the uppersurface of the display panel 10 converge to a vacant space locatedbetween the first protrusion portions p6_2 to p6_6 to alleviate thestress which may be exerted on the display panel 10.

FIGS. 5A to 5C illustrate views of stages in a method for forming thefirst protrusion portions p6_2 to p6_6 according to an exemplaryembodiment.

Referring to FIG. 5A, a specific material layer 21 is formed on thefirst protective film 20. The specific material layer 21 is a layerstacked on the first protective film 20 to form the first protrusionportions p6_2 to p6_6, and may include a material which is the same asor different from that of the first protective film 20. The specificmaterial layer 21 may include, e.g., polyethylenetherephthalate (PET),polyetylenenaphthalate, polycarbonate, polyarylate, polyetherimide,polyethersulphone, polyimide, etc. To form the first protrusion portionsp6_2 to p6_6 through an imprinting process, a mold substrate 22 may bedisposed to face the first protective film 20. The mold substrate 22 mayhave a plurality of grooves 23_1 to 23_6 embossed in a convexthree-dimensional shape.

Next, as illustrated in FIG. 5B, when the specific material layer 21formed on one surface of the first protective film 20 is pressed byusing the mold substrate 21, the first protrusion portions p6_2 to p6_6may be formed on the first protective film 20. Then, as illustrated inFIG. 5C, when the mold substrate 22 is detached from the firstprotective film 20, the first protective film 20 with the firstprotrusion portions p6_2 to p6_6 formed thereon may be completelyformed. In addition, the first protrusion portions p6_2 to p6_6 may beformed on the first protective film 20 using various patterningtechnology not limited to this embodiment.

FIG. 6 illustrates a cross-sectional view of a touch-screen panelincluding a second protective film having second protrusion portionsaccording to an exemplary embodiment.

Referring to FIG. 6, a touch-screen panel 40 is of an add-on type andmay be disposed on the upper surface of the polarizing plate 30. Thetouch-screen panel 40 may include a second protective film 25, twotransparent electrode layers ITO_Rx and ITO_Tx, and an adhesive film 50for attaching the transparent electrode layers ITO_Rx and ITO_Tx.

For the second protective film 25 disposed on the touch-screen panel 40,the aforementioned description about the first protective film 20 mayalso be identically applied. Therefore, the second protective film 25may also include a plurality of a second protrusion portions pp1_1 topp1_x and the second protrusion portions pp1_1 to pp1_x may be formed onat least one of an upper surface and a lower surface of the secondprotective film 25. In addition, the second protrusion portions pp1_1 topp1_x may be arranged in a first direction and a second directionparallel with the first and second bending axes D1 and D2, respectively.Furthermore, the second protrusion portions pp1_1 to pp1_x may have onethree-dimensional shape from among a sphere, a semi-sphere, arectangular cylinder, a triangular cylinder, a circular cylinder, atriangular pyramid, a cone and a hexagonal pyramid.

The touch-screen panel 40 may also include the second protective film 25having the second protrusion portions pp1_1 to pp1_x, and thus damage ofelements and surface creases of the touch screen panel 40, which may becaused by bending of the display panel 10, may be prevented.

Although only an add-on type touch screen 40 was described in thepresent embodiments, embodiments are not limited thereto. Theaforementioned description may be applied to any touch-screen panelincluding the second protective film 25 having a second protrusionportions pp1_1 to pp1_x. For example, the aforementioned description mayalso be applied in the case that the display device 1 includes anembedded type touch-screen panel having the second protective film 25.

FIG. 7 illustrates a cross-sectional view of a display device includingan adhesive film having three-dimensionally-shaped grooves according toan exemplary embodiment.

Referring to FIG. 7, the display device 1 may further include anadhesive film 50 for attaching the display panel 10 and the firstprotective film 20. The adhesive film 50 may include silicone, urethane,acryl, etc., and may further include nanoparticles including silicondioxide, aluminum, etc. The thickness of the adhesive film 50 may beabout 5 to about 50 μm, but is not limited thereto.

A plurality of grooves h1_1 to h1_x may be formed on at least onesurface of the upper and lower surfaces of the adhesive film 50. Theplurality of grooves h1_1 to h1_x may perform the same function as thoseof the first and second protrusion portions p1_1 to p10_7 and pp1_1 topp1_x. Therefore, the aforementioned descriptions about the first andsecond protective films 20 and 25 may also be applied to the adhesivefilm 50 having a plurality of grooves.

For example, the plurality of grooves h1_1 to h1_x are formed on theadhesive film 50 to be arranged in first and second directions parallelto the first and second bending axes D1 and D2, respectively. Inaddition, the plurality of grooves h1_1 to h1_x may have onethree-dimensional shape from among a sphere, a semi-sphere, arectangular cylinder, a triangular cylinder, a circular cylinder, atriangular pyramid, a cone and a hexagonal pyramid.

The plurality of grooves h1_1 to h1_x formed on the adhesive film 50 mayalleviate stress exerted on the display panel 10 and prevent creaseswhich may be formed on the surface of the display panel 10. The adhesivefilm 50 having the grooves h1_1 to h1_x may be disposed on the firstprotective film 20 instead of the protrusion portions p1_1 to p10_7.Also, the adhesive film 50 having the grooves h1_1 to h1_x may befurther included in the other surface of the first protective film 20having the first protrusion portions p1_1 to p10_7.

While embodiments have been described with reference to each of thedrawings for convenience of description, a new embodiment may beimplemented by combining the embodiments illustrated in the drawings. Inaddition, designing a recording medium readable by a computer having arecorded program for implementation of the previously describedembodiments according to necessity of those skilled in the art is alsowithin the scope of this specification. The configurations and methodsaccording to the above-described embodiments will not be applicable in alimited way to the display device, and all or parts of the embodimentsmay be selectively combined and configured to make various modificationsthereto.

By way of summation and review, when a display panel of a displaydevice, e.g., an organic light-emitting display device, is constructed,there are limitations in terms of portability of large screen displaysthat use glass substrate, i.e., which are heavy and easily broken.Therefore, there has recently been developed an organic light-emittingdisplay device in which a flexible plastic substrate, which islight-weight and may have varied shapes, is used as a substrate of adisplay panel. As a result, the shapes of display panels have becomefreely deformable.

However, when the shape of a display panel included in an organiclight-emitting display device is deformed, elements included in thedisplay panel may be damaged by an external force exerted on the displaypanel, or a surface of the display panel may be roughened, e.g.,scratched, so as to interfere with the user's view of a displayingscreen. Therefore, according to embodiments, a display panel includes aninternal structure of the display panel so that stress exerted on thedisplay panel may be alleviated and the surface of the display panel maymaintain smoothness.

Example embodiments have been disclosed herein, and although specificterms are employed, they are used and are to be interpreted in a genericand descriptive sense only and not for purpose of limitation. In someinstances, as would be apparent to one of ordinary skill in the art asof the filing of the present application, features, characteristics,and/or elements described in connection with a particular embodiment maybe used singly or in combination with features, characteristics, and/orelements described in connection with other embodiments unless otherwisespecifically indicated. Accordingly, it will be understood by those ofskill in the art that various changes in form and details may be madewithout departing from the spirit and scope of the present invention asset forth in the following claims.

What is claimed is:
 1. A display device, comprising: a display panelhaving a dome shape simultaneously bent upward with respect to a firstbending axis and a second bending axis such that the dome shape projectsupward, and the first and second bending axes intersect with each other,and the display panel comprising a display surface emitting light upwardand an opposite surface which is opposite to the display surface; apolarizing layer on an upper surface of the display panel; a firstprotective layer on a lower surface of the display panel, and anadhesive layer disposed between the display panel and the firstprotective layer, wherein the adhesive layer includes a plurality ofgrooves, and wherein the plurality of grooves arranged in a firstdirection parallel to the first bending axis and in a second directionparallel to the second bending axis.
 2. The display device as claimed inclaim 1, wherein the grooves are on at least one surface of an uppersurface and a lower surface of the adhesive layer.
 3. The display deviceas claimed in claim 1, wherein the grooves have shape of one of asphere, a semi-sphere, a rectangular cylinder, a triangular cylinder, acircular cylinder, a triangular pyramid, a cone, and a hexagonalpyramid.
 4. The display device as claimed in claim 1, wherein the firstprotective layer comprises a plurality of first protrusion portions, andthe plurality of first protrusion portions comprise protrusion portionsarranged in a first direction parallel to the first bending axis andprotrusion portions arranged in a second direction parallel to thesecond bending axis to form a plurality of rows and a plurality ofcolumns, the first protrusion portions having three-dimensional shapes.5. The display device as claimed in claim 4, wherein the adhesive layeris disposed between the display panel and an upper surface of the firstprotective layer, the plurality of first protrusion portions are formedon a lower surface of the first protective layer, and a predeterminedvacant space is formed between the plurality of first protrusionportions.
 6. The display device as claimed in claim 5, wherein in thestate where the display panel is bent with respect to the first bendingaxis and the second bending axis, protrusion portions of the pluralityof rows converge to the vacant space formed between the protrusionportions arranged along the first bending axis and protrusion portion ofthe plurality of columns converge to the vacant space formed between theprotrusion portions arranged along the second bending axis.
 7. Thedisplay device as claimed in claim 5, wherein: the lower surface of thefirst protective layer is exposed between bases of the first protrusionportions.
 8. The display device as claimed in claim 4, wherein: thefirst protrusion portions have a structure obtained by imprinting usinga mold substrate having a plurality of embossed grooves corresponding tothe first protrusion portions, and the three-dimensional shape of thefirst protrusion portions is a sphere, a semi-sphere, a rectangularcylinder, a triangular cylinder, a circular cylinder, a triangularpyramid, a cone, or a hexagonal pyramid.
 9. The display device asclaimed in claim 4, wherein: the first protective layer includes a firstmaterial that include polyethylenetherephthalate (PET),polyethylenenaphthalate, polycarbonate, polyarylate, polyetherimide,polyethersulphone, or polyimide, the first protrusion portions areformed by imprinting a second material that includespolyethylenetherephthalate (PET), polyethylenenaphthalate,polycarbonate, polyarylate, polyetherimide, polyethersulphone, orpolyimide using a mold substrate having a plurality of embossed groovescorresponding to the first protrusion, and the first material used forthe first protective layer is different from the second material usedfor the first protrusion portions.
 10. The display device as claimed inclaim 1, wherein the display panel includes an organic light-emittingelement.
 11. The display device as claimed in claim 1, furthercomprising a touch-screen panel on an upper surface of the polarizinglayer and sensing a touch input.
 12. The display device as claimed inclaim 11, wherein the touch-screen panel includes a second protectivelayer having second protrusion portions having three-dimensional shapes.13. The display device as claimed in claim 12, wherein the secondprotrusion portions are on at least one of an upper surface and a lowersurface of the second protective layer.
 14. The display device asclaimed in claim 12, wherein the second protrusion portions are arrangedin a first direction parallel to the first bending axis and a seconddirection parallel to the second bending axis.
 15. The display device asclaimed in claim 12, wherein the three-dimensional shape of the secondprotrusion portions is one of a sphere, a semi-sphere, a rectangularcylinder, a triangular cylinder, a circular cylinder, a triangularpyramid, a cone, and a hexagonal pyramid.
 16. A display device,comprising: a display panel having a curved shape bent with respect to abending axis and the display panel comprising a display surface emittinglight upward and an opposite surface which is opposite to the displaysurface; a polarizing layer on an upper surface of the display panel aprotective layer on a lower surface of the display panel, and anadhesive layer disposed between the display panel and the protectivelayer, wherein the adhesive layer includes a plurality of grooves, andwherein the plurality of grooves arranged in a first direction parallelto the first bending axis.
 17. The display device as claimed in claim16, wherein the grooves are on at least one surface of an upper surfaceand a lower surface of the adhesive layer.
 18. The display device asclaimed in claim 16, wherein the grooves are shape of one of a sphere, asemi-sphere, a rectangular cylinder, a triangular cylinder, a circularcylinder, a triangular pyramid, a cone, and a hexagonal pyramid.
 19. Thedisplay device as claimed in claim 16, wherein the protective layercomprises a plurality of protrusion portions, and the plurality ofprotrusion portions are arranged in a direction parallel to the bendingaxis.
 20. The display device as claimed in claim 19, wherein theadhesive layer is disposed between the display panel and an uppersurface of the protective layer, the plurality of protrusion portionsare formed on a lower surface of the protective layer.